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    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        
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<script>
    // var reg = /^[a-z\d]+(\.[a-z\d]+)*@([\da-z](-[\da-z])?)+(\.{1,2}[a-z]+)+$/;
    // 数字字母1+ (.数字字母1+)0+ @ (数字字母 (-数字字母)0或1)1+ (.1或2 字母1+)1+

    // var str =  "7623wvsb.23wt.ae@asgy-auwy2e3r..ahsjfg";
    // var str =  "7623wvsb.23wt.ae@asgy-a..u2wy5er..ahsjfg";

    // console.log(reg.test(str));
</script>
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